systrace

问题 My code works well with malloc , but not with mmap . The code is below: main.c #include <stdio.h> #include <stdlib.h> int main(){ int * p = (int*) malloc(sizeof(int)); printf("in main(): value p = %d\n", *p); free(p); } preload.c #define _GNU_SOURCE #include <time.h> #include <dlfcn.h> #include <stdio.h> #include <sys/types.h> void *(*orig_malloc)(size_t size); void *malloc(size_t size){ printf(" Hooked(preload)! malloc:size:%lu\n", size); return orig_malloc(size); } void * (*orig_mmap)(void

问题 I ran systrace on my android studio project in order to find some performance bugs but after the end of the tracing process, i get the following error and if i open the trace.html output file in chrome, the trace view is empty: Starting tracing (10 seconds) Tracing completed. Collecting output... Exception in thread Thread-13: Traceback (most recent call last): File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner self.run() File "C:\Python27\lib\threading.py", line 754, in run

问题 I collected a trace of my React-Native based Android app using systrace.py util from Android SDK into an html file. When I open this html trace file in either Chrome 50.0.2661.86 (64 bit), or Firefox 45.0.2, I see blank screen and a few JavaScript errors in Developer console. OS Ubuntu 14.04 64 bit OS. However on my Windows machine a html trace is rendered correctly without errors in Chrome 49.0.2623.112. Can anyone help me sort out this issue? 回答1: As a temporary workaround you can use the

问题 When investigating an game play stuttering issue, I found that bewteen eglSwapBuffer() from the game and postFramebuffer() in surfaceflinger, there is always a delay in "SurfaceView" lasts from 0.5ms to 10ms which seems pretty random and irrelevant to CPU load. What does this really represents? Does it has anything to do with VSYNC point of display? http://i.stack.imgur.com/n8MvG.png 回答1: That row represents a BufferQueue. The height of the element (0 or 1 in the visible portion of your trace

问题 I want to capture Systrace report on my Android phone while doing automated testing. It is unknown how long the testing will take, so I can't specify the --time period for the Systrace. Digging deeper in to the systrace.py , I found out that systrace is using atrace to get the kernel logs. I used adb shell atrace --help and got the following output: usage: atrace [options] [categories...] options include: -a appname enable app-level tracing for a comma separated list of cmdlines -b N use a

问题 I created a console program and run it in my android phone(android 6.0 and API LEVEL is 23). And it has a function named net_test, show as below. void net_test() { if (ATrace_isEnabled()) { printf("ATrace is enable!\n"); } else { printf("ATrace is disable!\n"); } ATrace_beginSection("net_test"); net_layer_test(); ATrace_endSection(); } I want to use systrace to capture the timing information of this function. so I add those ATrace_XXX() API. But ATrace_isEnabled() always returns false .I used

问题 I'm trying to measure performance attributes of my app through systrace by using the new Trace API introduced in JB 4.3. The idea is similar to the use of traceview method profiling, i.e. you can measure a specific code section using Trace.beginSection and Trace.endSection . However, when I run systrace through the python script provided in Android tools, I don't see anything relating to the sections specified by the above calls. Am I missing something? Is this the correct way of accessing

问题 I am trying to use systrace from Android Studio with the default systrace options set. I have not rooted the phone. HTC Sense v6.0, Android 5.0.1, HTC SDK API level 6.55. When I do so, I get the dreaded "Unable to collect system trace. Reason: unexpected error while collecting system trace". Using adb shell, I have determined that /sys/kernel/debug exists, but /sys/kernel/debug/tracing does not. Anyone else have better luck with systrace and HTC One M8 / lollipop? 来源： https://stackoverflow

问题 Here's the error message D:\Programming\Tools\ADT_bundle\sdk\platform-tools\systrace>python systrace.py Traceback (most recent call last): File "systrace.py", line 315, in <module> main() File "systrace.py", line 64, in main os.execv(legacy_script, sys.argv) OSError: [Errno 2] No such file or directory I look into systrace.py, it seems that the legacy_script "systrace-legacy.py" is missing on the file system. I have read several related posts on stackoverflow, and I've already put directory

问题 I've selected several of the trace tags and when I run the trace (from DDMS ) I get the following output: Unexpected error while collecting system trace. Unable to find trace start marker 'TRACE:': error opening /sys/kernel/debug/tracing/options/overwrite: No such file or directory (2) error openi (cuts off the error here) indeed there is no debug file in the kernel directory, but which mechanism will generate the necessary path? 回答1: It looks like your cellphone is running a boot(kernel)